linux-kernel - Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and hvc

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Date:	Fri, 26 Mar 2010 15:28:21 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Sachin Sant <sachinp@...ibm.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Greg Kroah-Hartman <gregkh@...e.de>, a.p.zijlstra@...llo.nl,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Anton Blanchard <anton@...ba.org>, tglx@...utronix.de,
	Linus Torvalds <torvalds@...ux-foundation.org>, mingo@...e.hu,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and
	hvc_remove

On (Fri) Mar 26 2010 [14:43:56], Sachin Sant wrote:
>> And this suggests that hvc_kick() is called before hvc_task is
>> initialised, ie, before hvc_init() is called.
>>
>> Does this help?
>>   
> Hi Amit,
>
> I too ran into this issue as reported by Anton. Unfortunately in my
> case the following suggested patch does not help boot the powerpc
> box successfully. The boot still hangs with following messages

Was the hang you saw before applying this patch at the same place / for
the same reason?

> /dev/sda5: clean, 229739/2097152 files, 2485598/8377888 blocks (check in 4 mounts)
> fsck succeeded. Mounting root device read-write.
> Mounting root /dev/sda5
> mount -o rw,acl,user_xattr -t ext3 /dev/sda5 /root
> kjournald starting.  Commit interval 5 seconds
> EXT3-fs (sda5): using internal journal
> EXT3-fs (sda5): mounted filesystem with writeback data mode
> mount: can't find /root/proc in /etc/fstab or /etc/mtab
> /sbin/smart_agetty: can not determine 'console' speed

OK, this gets even murkier. I don't know why taking a few krefs modifies
hvc_console behaviour to such an extent.

> Just to confirm i too am facing same issue as reported by Anton,
> reverted commit e74d098c66543d0731de62eb747ccd5b636a6f4c and that allowed
> by box to boot successfully.

Which module uses hvc_console in your case?

		Amit
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